TY - JOUR

T1 - Sub-kelvin temperature management in ion traps for optical clocks

AU - Nordmann, T.

AU - Didier, A.

AU - Doležal, M.

AU - Balling, P.

AU - Burgermeister, T.

AU - Mehlstäubler, T. E.

N1 - Funding Information: We thank Physikalisch-Technische Bundesanstalt Department 5.5 for collaboration on trap fabrication and S.A. King and H. Liu for helpful comments on this manuscript. This work originated from a collaborative project within the European Metrology Research Programme (EMRP) SIB04. We acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG) under Grant No. CRC SFB 1227 (DQ-mat, Project No. B03) through Germany’s Excellence Strategy EXC2123 QuantumFrontiers and from the BMBF under Grant No. 13N14962. The CMI participation in this project was funded by Institutional Subsidy for Long-Term Conceptual Development of a Research Organization granted to the CMI by the Ministry of Industry and Trade.

PY - 2020/11/24

Y1 - 2020/11/24

N2 - The uncertainty of the ac Stark shift due to thermal radiation represents a major contribution to the systematic uncertainty budget of state-of-the-art optical atomic clocks. In the case of optical clocks based on trapped ions, the thermal behavior of the rf-driven ion trap must be precisely known. This determination is even more difficult when scalable linear ion traps are used. Such traps enable a more advanced control of multiple ions and have become a platform for new applications in quantum metrology, simulation, and computation. Nevertheless, their complex structure makes it more difficult to precisely determine its temperature in operation and thus the related systematic uncertainty. We present here scalable linear ion traps for optical clocks, which exhibit very low temperature rise under operation. We use a finite-element model refined with experimental measurements to determine the thermal distribution in the ion trap and the temperature at the position of the ions. The trap temperature is investigated at different rf-drive frequencies and amplitudes with an infrared camera and integrated temperature sensors. We show that for typical trapping parameters for In+, Al+, Lu+, Ca+, Sr+, or Yb+ ions, the temperature rise at the position of the ions resulting from rf heating of the trap stays below 700 mK and can be controlled with an uncertainty on the order of a few 100 mK maximum. The corresponding uncertainty of the trap-related blackbody radiation shift is in the low 10-19 and even 10-20 regime for 171Yb+(E3) and 115In+, respectively.

AB - The uncertainty of the ac Stark shift due to thermal radiation represents a major contribution to the systematic uncertainty budget of state-of-the-art optical atomic clocks. In the case of optical clocks based on trapped ions, the thermal behavior of the rf-driven ion trap must be precisely known. This determination is even more difficult when scalable linear ion traps are used. Such traps enable a more advanced control of multiple ions and have become a platform for new applications in quantum metrology, simulation, and computation. Nevertheless, their complex structure makes it more difficult to precisely determine its temperature in operation and thus the related systematic uncertainty. We present here scalable linear ion traps for optical clocks, which exhibit very low temperature rise under operation. We use a finite-element model refined with experimental measurements to determine the thermal distribution in the ion trap and the temperature at the position of the ions. The trap temperature is investigated at different rf-drive frequencies and amplitudes with an infrared camera and integrated temperature sensors. We show that for typical trapping parameters for In+, Al+, Lu+, Ca+, Sr+, or Yb+ ions, the temperature rise at the position of the ions resulting from rf heating of the trap stays below 700 mK and can be controlled with an uncertainty on the order of a few 100 mK maximum. The corresponding uncertainty of the trap-related blackbody radiation shift is in the low 10-19 and even 10-20 regime for 171Yb+(E3) and 115In+, respectively.

UR - http://www.scopus.com/inward/record.url?scp=85096993369&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2008.04231

DO - 10.48550/arXiv.2008.04231

M3 - Article

C2 - 33261420

AN - SCOPUS:85096993369

VL - 91

JO - Review of scientific instruments

JF - Review of scientific instruments

SN - 0034-6748

IS - 11

M1 - 111301

ER -